Tool-holder for metal-working machines.



J. W.'CARR. TOOL HOLDER FOR METAL WORKING MACHINES APPLICATION FILEDSEPT-5.1911.

Patented Apr. 9,1918.

mvm'ron; JAmEs W CHM? JAMES WILLIAM CARR,

OF LONDON, ENGLAND.

TOOL-HOLDER FOB METAL-WORKING MACHINES.

Specification of Letters Patent.

Patented Apr. 1918.

Application filed September 5, 1917. Serial No. 189,753.

[0 all whom it may concern:

Be it known that I, JAMES WILLIAM CARR, a subject of the King of theUnited Kingdom of Great Britain and Ireland, and resident of London,England, have invented a certain new and useful Improvement in andRelating to Tool-Holders for Metal-Vorking Machines, of which thefollowing is a specification.

This invention relates to turret tool holders of the kind in which thetools are secured in a tool case integral with a spindle which passesthrough a split bearing adapted to be clamped by a handle to lock thespindle to the holder and in which the tools are held in operativeposition by a pawl engaging a ratchet secured to said spindle. Theinvention has for its object to improve generally the construction ofsuch tool holders.

A feature of the invention consists in an improved arrangement wherebythe pawl is continuously maintained in engagement with the ratchetwheel. Another feature consists in the improved disposition of theclamping means for the split hearing.

The invention is illustrated in the accompanying drawing in which Figure1 is a front view, Fig. 2 a rear view and Fig. 3 a plan partly insection of the improved tool holder.

With reference to the drawings, 1 denotes the tool holder arm which isformed at one end with a split bearing 2 in which is mounted the spindle3 carrying thereon the tool case having the tools 5 secured therein inknown manner. To the end of the spindle 3 opposite that carrying thetool case is secured by means of a screw 6 a ratchet 7 with which isadapted to cooperate a pawl 8 pivoted at 9 on the arm 1. In accordancewith one feature of this invention the pawl 8 is provided with adepending pin 10 engaged by a piston 11 located in a pocket 12 in thetool holder arm 1 said piston being pressed forward in the pocket 12 bya helical spring 13 which at one end abuts against the end of the pocket12 and at its other end surrounds the reduced end of the piston 11. Aplate 14 secured by screws 15 prevents the entrance of dust into thepocket 12. The ratchet teeth are provided as heretofore us ual withadjustable stops 16 in the form of screws threaded therein.

In accordance with a further feature of this invention the split bearing2 is clamped by means of a clamp 17 having a Wedge shaped face 18engaging in a corresponding surface on the arm and having a tighteningscrew 19 secured to the handle 20 and threaded in the clamp so that onrotation of the handle in one direction the screw 19 draws the separatedfaces of the split bearing 2 together.

WVliat I claim is 1. A tool holder for metal working machines comprisingan arm having a split bearing, a spindle mounted in said arm a tool casecarried by said spindle at one end thereof, a ratchet secured to saidspindle at the end of said spindle remote from said tool case a pawlpivoted to said arm and adapted to engage with said ratchet, a pocket insaid arm in proximity to said pawl, a piston located in said pocket, anda spring located in said pocket and adapted to actuate said piston tocause said piston to engage said pawl, substantially as and for thepurpose described.

2. A tool holder for metal working machines comprising an arm having asplit bearing, a spindle mounted in said arm, a tool case carried bysaid spindle at one end thereof, a ratchet secured to said spindle atthe end of said spindle remote from said tool case, a pawlvpivoted tosaid arm and adapted to engage with said ratchet, a projection dependingfrom said pawl, a pocket in said arm to receive said projection, apistonlocated in said pocket, and a sprlng located in said pocket and adaptedto actuate said piston to cause, said piston L0 engage said projection,substantially as and for the purpose set forth.

3. A tool holder for metal working machines comprising an arm having asplit bearing, a spindle mounted in said arm, a tool case carried bysaid spindle at one end thereof, a ratchet secured to said spindle atthe end of said spindle remote from said tool case, a pawl pivoted tosaid arm and adapted to engage with said ratchet, a projection dependingfrom said pawl, a pocket in said arm to receive said projection, apiston located in said pocket, a spring located in said pocket andadapted to actuate said piston to cause said piston to engage saidprojection, a clamp adapted to clamp the ends of the arm forming thesplit means for tightening said clamp, said means name to thisspecification in the presence of conslstlng of a screw threaded 1n saidclamp two subscrlbing wltnesses. and adapted to o'nta'ct the face of thearm opposite the Wedge shaped i face of the arm, JAMES WI Asubstantially as and for the purpose set WVit nesses: forth; E. TYLER,

I'Ii tetimony whereof I have signed my JOHN S. ARMSTRONG.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. 0,

